Are they the products of meiosis or fertilization?
What will be an ideal response?
A product of fertilization.
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Epidermal growth factor (EGF) secreted from an anchor cell binds to its receptor on a nearby cell and initiates signal transduction. Which statement describing this signaling pathway is not correct?
A. In response to EGF binding to its receptor, a series of protein phosphorylations occur which amplify the signal at each step. B. Certain key phosphorylated proteins enter the nucleus and act as transcription activators for the Notch gene. C. The Notch protein is a transmembrane protein that is inserted across the plasma membrane and acts as a ligand for a Notch receptor on the adjacent cell that will then become a type 2 cell. D. Transcription of the Notch ligand in the type 1 cell results in an inhibition of the Notch receptor in the type I cell and in an inhibition of the EGF receptor in the adjacent cell destined to differentiate into a type 2 cell. E. EGF and Notch ligands are unique to nematodes and only found in Caenorhabditis elegans.
Which of the following is NOT one of the lobes of the cerebral cortex?
A. frontal B. parietal C. occipital D. temporal E. basal
Which of the following is correct about the protease inhibitor drugs designed to treat HIV infection?
A. They result in lysis of virus particles B. They cure the disease C. They prevent entry of the virus into cells D. They slow the progress of the disease
Which of the following statements concerning centrioles is FALSE?
a. They are present in most animal cells but not most plant cells. b. They are duplicated before cell division. c. They have a 9 + 2 arrangement of microtubules. d. They are found in the centrosome. e. They are thought to play a role in microtubule assembly.